JP5910149B2 - Fuel pump device for vehicle engine - Google Patents

Description

  The present invention relates to a fuel pump device for a vehicle engine.

  As an engine arrangement structure in an engine room covered with an engine hood, a structure described below is known (for example, see Patent Document 1). In this arrangement structure, the engine is mounted such that the crankshaft is along the vehicle width direction. In this arrangement structure, on-vehicle components such as a battery and an air cleaner are arranged on one side of the engine room in the vehicle width direction of the engine. Further, in this conventional structure, a brake booster is disposed on the other side in the vehicle width direction of the engine in the engine room and between the engine and the dash panel.

  On the other hand, as a conventional fuel pump device mounting structure, a structure is known in which a fuel pump device (including an accessory housing member) is mounted on an axial side portion (side wall) of a cam shaft on an outer peripheral wall of a cylinder head. (For example, refer to Patent Document 2). In the fuel pump device mounting structure disclosed in Patent Document 2, the fuel pump device is mounted in a cantilever manner on the outer peripheral wall of the cylinder head.

JP 2007-177713 A JP 2011-38431 A

  The fuel pump device is a heavy object including a metal accessory housing. Therefore, such a fuel pump device mounting structure has a problem that the fuel pump device easily vibrates due to engine vibration. Further, there is a problem that the strength of the cam shaft is disadvantageous because the cam shaft is in a cantilever state. For this reason, in the mounting structure of the fuel pump device, vibrations of the cam shaft and the cylinder head easily occur, and the strength and rigidity of each component are inferior.

Here, the case where the mounting structure of the fuel pump device is applied to the engine arrangement structure disclosed in Patent Document 1 will be considered. In this case, on one side in the vehicle width direction of the engine room battery, since the vehicle parts such as the air cleaner is placed, placing the fuel pump equipment on the other side in the vehicle width direction of the engine. In this case, the fuel pump device largely protrudes from the side wall of the cylinder head toward the other side in the vehicle width direction. Thus, when the mounting structure of the fuel pump device is applied to the engine arrangement structure disclosed in Patent Document 1, a large space is required for arranging the fuel pump device on the other side in the vehicle width direction of the engine room. It becomes. For this reason, it is necessary to move the position of the engine further to one side in the vehicle width direction, and it becomes difficult to secure the volume of the space on one side in the vehicle width direction of the engine in the engine room. Therefore, when the mounting structure described above is employed, the volume of in-vehicle components such as an air cleaner and a battery cannot be sufficiently increased, and the intake performance and battery performance of the engine may be reduced.

  The present invention has been made in view of the above problems, and can secure the volume of in-vehicle components arranged around the engine, suppress vibrations, and protect when an external force is applied to the vehicle. An object of the present invention is to provide a fuel pump device for a vehicle engine that can perform the above-described operation.

To solve the above problems and achieve the object, an aspect of the present invention, in an engine room covered with an engine hood, the crankshaft vehicle engine is arranged along the vehicle width direction In both cases, an in-vehicle component is disposed on one side of the vehicle engine in the vehicle width direction, and a brake is provided on the other side of the engine room in the vehicle width direction between the vehicle engine and a dash panel provided at the rear end of the engine room. An arrangement structure in which a booster is arranged. The cylinder head that constitutes the vehicle engine is provided with a journal bearing portion that supports the lower side of the cam shaft, and the upper portion of the journal bearing portion is arranged to rotate the upper side of the cam shaft. A cam housing that is integrally formed with a cam cap that is freely supported and a frame that is fastened to the outer periphery of the cylinder head, and is driven by the rotation of the cam shaft. The fuel pump device for a vehicle engine includes a fuel pump main body and a fuel pump mounting portion, and an engine hood side and a dash panel from the camshaft to the other end portion in the vehicle width direction at the upper portion of the cam housing. A fuel pump mounting portion that is inclined obliquely rearward and upward toward the side is provided.

  In the above aspect, the camshaft includes a front camshaft extending in the vehicle width direction on the front side of the vehicle and a rear camshaft extending in the vehicle width direction on the vehicle rear side of the front camshaft, and the lower end of the fuel pump main body The movable part provided in the part is arranged toward the front camshaft.

  In the above aspect, the fuel pump mounting portion is disposed so as to straddle the front cam shaft and the rear cam shaft, and connects the upper portion of the front cam shaft and the upper portion of the rear cam shaft in the cam housing. It is characterized by that.

  As said aspect, vehicle-mounted components are an air cleaner and a battery, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, while providing the volume of the vehicle-mounted components arrange | positioned around an engine, the fuel pump apparatus of the vehicle engine which can suppress when a vibration is suppressed and external force acts on a vehicle is provided. can do.

FIG. 1 is a plan view of a front portion of a vehicle including a fuel pump device for a vehicle engine according to an embodiment of the present invention. FIG. 2 is a side view showing a state in which a vehicle front portion provided with a fuel pump device for a vehicle engine according to an embodiment of the present invention is viewed from the other side (right side) in the vehicle width direction. FIG. 3 is a plan view showing a state in which the cylinder head cover and the cam housing are removed from the vehicle engine including the fuel pump device according to the embodiment of the present invention. FIG. 4 is a side view showing the periphery of the fuel pump device in the vehicle engine according to the embodiment of the present invention. 5 is a cross-sectional view taken along the line V-V in FIG. FIG. 6 is a perspective view showing the periphery of the fuel pump device in the vehicle engine according to the embodiment of the present invention. FIG. 7 is a side view showing a state in which the front portion of the vehicle is viewed from the other side (right side) in the vehicle width direction, including a fuel pump device and a comparative example in the vehicle engine according to the embodiment of the present invention. is there.

  Details of a fuel pump device for a vehicle engine (hereinafter referred to as an engine) according to an embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, for convenience of explanation, the front-rear direction, the left-right direction, and the up-down direction of the vehicle are indicated by arrows in the drawing.

(Schematic configuration in the engine room)
As shown in FIG. 1, the fuel pump device 100 according to the present embodiment is attached to an engine 4 mounted in an engine room 3 of a vehicle front portion 2 </ b> A of the vehicle 2. As shown in FIG. 2, the upper portion of the engine room 3 is covered with an engine hood 5 that is inclined so as to increase from the front end toward the rear end. The rear end of the engine room 3 is partitioned from the vehicle compartment 7 by a dash panel 6. As shown in FIG. 1, an air cleaner 8 and a battery 9 as in-vehicle parts are arranged on one side (left side) of the engine 4 in the engine width 3 in the engine room 3. A brake booster 10 is disposed between the engine 4 and the dash panel 6 on the other side (right side) of the engine room 3 in the vehicle width direction.

(Engine configuration)
As shown in FIG. 2, the engine 4 includes a cylinder block 11, a cylinder head 12 provided on the cylinder block 11, a lower crankcase 13 provided below the cylinder block 11, and a cylinder head 12. A cam housing 14 and a cylinder head cover 19 are provided. In the present embodiment, as shown in FIG. 3, for example, as shown in FIG. 3, the cylinder block 11 and the cylinder head 12 have a first cylinder # 1, a second cylinder # 2, a third cylinder # 3, and a third cylinder. Four cylinders # 4 are provided. As shown in FIG. 3, a pair of intake valves (not shown) are provided at positions corresponding to the first cylinder # 1, the second cylinder # 2, the third cylinder # 3, and the fourth cylinder # 4 in the cylinder head 12, respectively. And a pair of exhaust valves.

  As shown in FIG. 2, a crankshaft 16 is pivotally supported between the lower portion of the cylinder block 11 and the lower crankcase 13. As shown in FIG. 1, the engine 4 is arranged in the engine room 3 so that the axis 16 </ b> A of the crankshaft 16 extends in the vehicle width direction.

  As shown in FIGS. 3 and 6, a cam chamber 12 </ b> A that is recessed downward is provided in the upper part of the cylinder head 12. The peripheral edge of the cam chamber 12 </ b> A is an outer peripheral wall portion 12 </ b> B having a jetty shape that rises along the outer periphery of the upper end surface of the cylinder head 12. In the cam chamber 12A, a front cam shaft (exhaust cam shaft) 17A and a rear cam shaft (intake cam shaft) 17B are arranged in parallel as cam shafts. The axis 17Ac and the axis 17Bc are set so as to be parallel to the axis 16A of the crankshaft 16. Note that the lower surfaces (half circumferential surfaces) of the front cam shaft 17A and the rear cam shaft 17B are a plurality of journal bearings formed in the cam chamber 12 along a direction (vehicle longitudinal direction) orthogonal to the axis 16A of the crankshaft 16. It is rotatably mounted on the part 12C.

  The cam housing 14 is placed on the cam chamber 12A. As shown in FIG. 6, the upper surfaces (half circumferential surfaces) of the front cam shaft 17A and the rear cam shaft 17B are rotatably held by a cam cap 14B described later on the cam housing 14 side. As shown in FIG. 3, the front cam shaft 17A includes a plurality of cams 18A. The cam 18A drives an exhaust valve (not shown) via a rocker arm (not shown). Further, the rear cam shaft 17B includes a plurality of cams 18B. The cam 18B drives an intake valve (not shown) via a rocker arm (not shown). In the present embodiment, a drive cam 101 for driving the fuel pump device 1 is provided in the vicinity of the end portion on the other side (right side) of the front cam shaft 17A in the vehicle width direction.

  As shown in FIG. 6, the cam housing 14 includes a frame portion 14 </ b> A that is placed along the outer peripheral wall portion 12 </ b> B of the cylinder head 12. The frame portion 14A has a structure that opens above the cam chamber 12A in which the front camshaft 17A is disposed. A cam cap 14B is formed on the frame portion 14A at a position corresponding to the journal bearing portion 12C formed on the upper end surface of the cylinder head 12. That is, the cam cap 14B is installed over two places in the vehicle front-rear direction of the frame portion 14A. In the cam housing 14, a cylinder head cover 19 is disposed on the cam chamber 12A in which the front cam shaft 17A is disposed. The cylinder head cover 19 is fixed to the cam housing 14.

  On the other hand, in the cam housing 14, a top plate 14C is formed in an area corresponding to the cam chamber 12A in which the rear cam shaft 17B is formed. Therefore, in a state where the cam housing 14 is placed on the cylinder head 12, the cam chamber 12A in which the rear cam shaft 17B is formed is closed by the top plate 14C. In particular, in the present embodiment, the fuel pump mounting portion 102 is integrally formed on the other side (right side) of the cam housing 14 in the vehicle width direction. As shown in FIG. 6, the cam housing 14 placed on the cylinder head 12 is fastened with bolts 20 at a plurality of locations.

(Configuration of fuel pump device)
As shown in FIG. 6, the fuel pump device 1 according to the present embodiment includes the drive cam 101, the fuel pump mounting portion 102, and a fuel pump main body 100. The fuel pump device 1 may be a high-pressure fuel pump.

  As shown in FIGS. 5 and 6, the drive cam 101 is formed in an elliptical shape (elliptical column shape). The front cam shaft 17 </ b> A fixes the drive cam 101 in a state of passing through the center of the drive cam 101. The cam profile of the drive cam 101 can be changed as appropriate according to the characteristics of the fuel pump main body 100.

  Next, the structure of the fuel pump mounting portion 102 will be described mainly with reference to FIGS. As shown in FIG. 5, the fuel pump mounting portion 102 has a structure in which the upper portion of the front cam shaft 17 </ b> A and the upper portion of the rear cam shaft 17 </ b> B are connected across the cam housing 14.

  As shown in FIG. 5, the fuel pump mounting portion 102 is formed with a mounting port 103 through which the fuel pump main body 100 is inserted. The front end portion 103A of the mounting port 103 opens toward the drive cam 101 on the front cam shaft 17A side. In addition, the mounting port 103 is a through-hole that is inclined rearward and rearward upward in the vehicle along the rear end portion 103B from the front end portion 103A. A portion below the mounting port 103 in the fuel pump mounting portion 102 is a connection reinforcing portion 104 that becomes a thick portion in the vehicle front-rear direction.

  As shown in FIG. 5, the fuel pump main body 100 includes an insertion portion 100 </ b> B including a movable portion (lifter) 100 </ b> A driven by a drive cam 101 and a plunger (not shown) that reciprocates in the axial direction along with the movement of the movable portion 100 </ b> A. And a control unit 100C including a control valve, a check valve, a pressurizing chamber, and the like (not shown), and a connection unit 100D connected to a vehicle-side fuel tank (not shown) via a pipe (not shown).

  As shown in FIG. 5, the fuel pump main body 100 is fixed in a state where the insertion portion 100 </ b> B is fitted to the mounting port 103 of the fuel pump mounting portion 102. At this time, the movable portion 100A of the fuel pump main body 100 is in sliding contact with the outer peripheral surface (cam surface) of the drive cam 101. Therefore, as shown in FIG. 2, as a result of attaching the fuel pump main body 100 to the fuel pump mounting portion 102, the fuel pump main body 100 is obliquely rearward upward from the front camshaft 17A toward the engine hood 5 side and the dash panel 6 side. It is fixed with the posture which inclines to.

(Operation and effect of fuel pump device)
The fuel pump device 1 according to the present embodiment described above has a structure in which the engine room 3 does not protrude toward the other side (right side) in the vehicle width direction with respect to the engine 4. For this reason, in-vehicle components such as the air cleaner 8 and the battery 9 arranged on one side (left side) in the vehicle width direction of the engine room 3 do not take up arrangement space in the fuel pump device 1 when viewed in plan. Therefore, in the fuel pump device 1 according to the present embodiment, the volume of in-vehicle components such as the air cleaner 8 and the battery 9 can be increased, and the battery performance and the intake performance of the engine can be improved.

  As shown in FIGS. 2 and 7, the engine hood 5 is normally inclined so that the height increases from the front end to the rear end in the vehicle front-rear direction. When the fuel pump main body 200 as a comparative example indicated by a one-dot chain line in FIG. 7 is disposed obliquely upward and rearward from the rear cam shaft 17B, the fuel pump main body 200 interferes with the brake booster 10. In addition, a fuel pump main body 300 as a comparative example indicated by a one-dot chain line in FIG. 7 is disposed so as to stand right above the front camshaft 17A. Further, a fuel pump main body 400 as a comparative example shown by a one-dot chain line in FIG. 7 is disposed obliquely forward and upward from the front camshaft 17A. In the fuel pump main bodies 300 and 400 as comparative examples, when a pedestrian contacts the engine hood 5, the engine hood 5 and the fuel pump main bodies 300 and 400 strongly interfere with each other, and the deformation amount of the engine hood 5 is reduced. .

  In contrast, as shown in FIG. 7, in the present embodiment, the fuel pump main body 100 is inclined obliquely rearward of the vehicle from the front camshaft 17A toward the engine hood 5 side and the dash panel 6 side. The clearance L1 between the engine hood 5 and the upper end portion (connecting portion 100D) of the fuel pump main body 100 can be set long. With such a configuration, when the pedestrian comes into contact with the engine hood 5, the deformation amount of the engine hood 5 can be increased. Therefore, when the pedestrian comes into contact with the engine hood 5, the engine hood 5 and the fuel pump main body 100 can be prevented from strongly interfering with each other, and the impact transmitted to the pedestrian can be reduced. Moreover, when the pedestrian contacts the engine hood 5, the fuel pump device 1 can be protected by increasing the deformation amount of the engine hood 5. Furthermore, the fuel pump device 1 according to the present embodiment does not interfere with the brake booster 10. Therefore, the brake booster 10 can be expanded without being affected by the fuel pump main body 100, and the brake performance can be improved.

  In the present embodiment, the fuel pump mounting portion 102 is integrally formed on the upper surface of the cam housing 14. For this reason, in the present embodiment, the fuel pump main body 100 can be held in the cylinder head 12 in a stable state as compared with the conventional structure in which the fuel pump main body 100 is attached to the side surface of the cylinder head 12. Therefore, in the fuel pump device 1 according to the present embodiment, the vibration of the fuel pump device 1 (particularly, the fuel pump main body 100) can be reduced.

  Generally, vibrations generated by rotation of the cam shafts (the front cam shaft 17A and the rear cam shaft 17B) are transmitted to the cam cap 14B and transmitted to the cam housing 14 and the cylinder head 12. Therefore, the cam housing 14 is most easily vibrated between the front cam shaft 17A and the rear cam shaft 17B, and the entire cam housing 14 is easily deformed.

  Therefore, in this embodiment, since the fuel pump mounting portion 102 is formed integrally with the cam housing 14, the fuel pump is provided around the cam shafts (the front cam shaft 17A and the rear cam shaft 17B) in the cam housing 14. The connection reinforcement part 104 which is a part of the attachment part 102 can be formed (refer FIG. 5). Since the connection reinforcing portion 104 is formed on the lower side of the fuel pump main body 100 inclined with respect to the cam housing 14, a relatively thick rib-like structure in the cam housing 14 is formed. Therefore, the rigidity of the cam housing 14 can be increased by integrally forming the fuel pump mounting portion 102 on the cam housing 14. For this reason, the fuel pump mounting portion 102 has a reinforcing function for suppressing deformation of the cam housing 14. Further, when the rigidity of the cam housing 14 is increased, deformation of the cam shaft (the front cam shaft 17A and the rear cam shaft 17B) and the cylinder head 12 can be suppressed, and the cylinder head 12 and the cam shaft (the front cam shaft 17A) can be suppressed. And the vibration of the rear camshaft 17B) can be reduced.

(Other embodiments)
Although the embodiment has been described above, it should not be understood that the description and the drawings constituting a part of the disclosure of the embodiment limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. For example, in the above-described embodiment, the present invention is applied to the engine 4 having an in-line four-cylinder structure. However, the present invention can be applied to various engines having a cylinder head 12 having a cam shaft.

DESCRIPTION OF SYMBOLS 1 Fuel pump apparatus 3 Engine room 4 Engine (vehicle engine)
5 Engine hood 6 Dash panel 8 Air cleaner (on-vehicle parts)
9 Battery (on-vehicle parts)
DESCRIPTION OF SYMBOLS 10 Brake booster 11 Cylinder block 12 Cylinder head 12C Journal bearing part 14 Cam housing 14A Frame part 14B Cam cap 16 Crankshaft 17A Front side camshaft 17B Rear side camshaft 19 Cylinder head cover 100 Fuel pump main body 101 Drive cam 102 Fuel pump attachment part 104 Connection reinforcement

Claims (4)

The covered in the engine room to the engine hood, both the crank shaft is arranged a vehicle engine so as to extend along the vehicle width direction, the vehicle-mounted parts are disposed on one side of the vehicle width direction of the vehicle engine, the on the other side of the vehicle width direction of the engine room, the a arrangement in which brake booster is arranged between the vehicle engine and the dash panel provided at a rear end of the engine room, the vehicle engine A cylinder head comprising a journal bearing portion that supports the lower side of the cam shaft, and a cam cap that is disposed above the journal bearing portion and rotatably supports the upper side of the cam shaft, and an outer peripheral edge of the cylinder head A fuel pump for a vehicle engine, comprising a cam housing integrally formed with a frame to be fastened and driven by rotation of the cam shaft In the device,
A fuel pump main body and a fuel pump mounting portion;
The fuel pump mounting portion that is inclined obliquely upward and rearward from the cam shaft toward the engine hood side and the dash panel side is provided at the other end in the vehicle width direction at the upper portion of the cam housing. A fuel pump device for a vehicle engine. The cam shaft has a front cam shaft extending in the vehicle width direction on the vehicle front side, and a rear cam shaft extending in the vehicle width direction on the vehicle rear side of the front cam shaft,
The fuel pump device for a vehicle engine according to claim 1, wherein a movable portion provided at a lower end portion of the fuel pump main body is disposed toward the front camshaft. The fuel pump mounting portion is disposed so as to straddle the front cam shaft and the rear cam shaft, and connects the upper portion of the front cam shaft and the upper portion of the rear cam shaft in the cam housing. the fuel pump device for a vehicle engine according to 請 Motomeko 2 you, characterized in that.   The fuel pump device for a vehicle engine according to any one of claims 1 to 3, wherein the on-vehicle components are an air cleaner and a battery.